<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>Number.NaN属性</h1>

<script>
    console.info(isNaN('number')); // true
    console.info(isNaN('1000')); // false
    console.info(isNaN(1000)); // false
</script>
</body>
</html>